There is indeed a Boss 351. The car and the motor were built only in 1971 and only 1,806 were built. The Boss 351 was one of 5 versions of the Cleveland in 71. It used the same big valve heads that were used on the Boss 302, was factory rated at 330hp and the compression ratio was 11.7:1. Other features of this motor were forged pistons, forged crank, a solid lifter cam with special valve springs, 750cfm Autolite carb, dual point distributor, 1041-h forged steel rods, 4 bolt mains, oversized bearing caps and a factory aluminum intake. As far as the Boss 302, there are lots of differences between it and a "regular" 302. It used the big valve Cleveland heads, solid lifter cam with special valve springs, dual point distributor, 4 bolt mains with oversized bearing caps, 1041-h forged steel rods, forged aluminum pistons, and a 780 Holley on an aluminum intake. The vin on these cars carried a G indicating the unique Boss engine. Both cars used a rev limiter which randomly cut out one cylinder at 6150 rpm. BTW, this info comes from the best source I could find, 2 guys in my club who own an original Boss 302 and an original Boss 351 who let me copy some of the reference material they have collected on their cars.
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1965 K code coupe - numbers matching - restoration ongoing. 1987 LX notch, stock heads and intake, 3.55's and typical bolt on's 13.89@100.25
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